Wall unit



FIG. 1 is a front view in elevation of a wall unit showing my new design;

FIG. 2 is a rear view in elevation thereof;

FIG. 3 is a right view in elevation thereof;

FIG. 4 is a left view in elevation thereof;

FIG. 5 is a top view in plan thereof; and,

FIG. 6 is a bottom view in plan thereof. 

The ornamental design for a wall unit, as shown and described. 